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    <title>Document</title>
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<body>
    <!-- <style>
        a {
            text-decoration: none;
        }
    </style>
    <a href="#">这是超链接</a> -->

    <!-- <style>
        div {
            text-decoration: line-through;
        }
    </style>

    <div>这是一句话</div> -->

    <!-- <style>
        p {

            text-indent: 2em;
        }
    </style>
    <p>
        这是一段话. Lorem ipsum dolor sit, amet consectetur adipisicing elit. Debitis veritatis quo fugiat dolor alias, nisi voluptatum nostrum distinctio exercitationem nam dicta odit minus unde eum dignissimos tenetur rem enim cupiditate.
   Lorem ipsum dolor, sit amet consectetur adipisicing elit. Officiis fuga accusamus recusandae hic, asperiores quasi dicta ullam, harum illo aliquam, reprehenderit aut aspernatur porro ducimus fugiat animi nostrum aliquid corporis.
    </p> -->

    <!-- <style>
        .two {
            line-height: 50px;
        }
    </style>
    <div class="one">
        上一行
    </div>
    <div class="two">
        中间行
    </div>
    <div>
        下一行
    </div> -->
    <!-- <style>
        /* body {
            background-color: rgb(67, 176, 55);
        } */
        div {
            width: 900px;
            height: 500px;
            font-size: 20px;
             background-color: brown; 
            background-image: url(风景照.jpg);
            background-repeat: no-repeat;
            background-position: center center;  
            background-size: contain;
            text-align: center;
            line-height: 500px;
        }
    </style> -->

    <style>
        div {
            width: 200px;
            height: 100px;
            background-color: red;
            color: white;
            border: 2px solid green ;
            border-radius: 50px;
        }
    </style>
    <div>
        这是一段话
    </div>
</body>
</html>